2x+1y=1000 x+y=200 x+y=...?

Jawabannya:
2x+1y=1000 |×1|
x+y=200. |×1|

2x+1y=1000
x+1y=200
----------------
x = 800

subs ke
2x+1y=1000
= 2(800)+1y=1000
= 1600 + 1y= 1000
y= 1600-1000
y= 600

maka
x+y
= 800+600
= 1400

Jadikan Terbaik Ya
Semoga Membantu

2x + y = 1000
X + y = 200 → x = 800

800 + y = 200
Y = -600

X + y = 800 + (-600)
= 200